Iota Aquilae
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Star ι Aquilae |
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Eagle | ||||||||||||||||
| Right ascension | 19 h 36 m 43.28 s | ||||||||||||||||
| declination | -01 ° 17 ′ 11.8 ″ | ||||||||||||||||
| Apparent brightness | 4.36 likes | ||||||||||||||||
| Typing | |||||||||||||||||
| B − V color index | −0.08 | ||||||||||||||||
| U − B color index | −0.44 | ||||||||||||||||
| R − I index | −0.08 | ||||||||||||||||
| Spectral class | B5 III | ||||||||||||||||
| Astrometry | |||||||||||||||||
| Radial velocity | (−21.4 ± 4.1) km / s | ||||||||||||||||
| parallax | (8.34 ± 0.79) mas | ||||||||||||||||
| distance | (390 ± 40) ly (120 ± 11) pc |
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| Visual absolute brightness M vis | approx. −1.0 mag | ||||||||||||||||
| Proper movement | |||||||||||||||||
| Rec. Share: | (−0.87 ± 0.79) mas / a | ||||||||||||||||
| Dec. portion: | (−20.39 ± 0.37) mas / a | ||||||||||||||||
| Physical Properties | |||||||||||||||||
| Dimensions | 4.3 M ☉ | ||||||||||||||||
| radius | 3.6 R ☉ | ||||||||||||||||
| Luminosity |
445 L ☉ |
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| Effective temperature | 14,000 K | ||||||||||||||||
| Rotation time | <2.5 days | ||||||||||||||||
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Other names and catalog entries |
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ι Aquilae ( Iota Aquilae , short ι Aql ) is a star in the constellation Eagle . He is one of the two as Al Thalimain (الثالمين, DMG aṯ-Ṯālimain 'the (two) ostriches') designated stars and was named Al Thalimain Posterior . The second is λ Aquilae , which is differentiated from Iota Aquilae as Al Thalimain Prior .
Iota Aquilae has an apparent magnitude of 4.4 mag, is almost 400 light years away from the sun and has the spectral class B5. Therefore it is a hot star with a surface temperature of 14,000 Kelvin. In the star catalogs it is listed as a giant star , but the calculation of its dimensions (4.3 times the solar mass, 3.6 times the solar radius) shows that it is actually a main sequence star that is only about to reach the stage of a red giant . It has an optical (i.e. not gravitationally bound), 13.0 mag bright companion at an angular distance of 47.0 ".
Web link
swell
- ↑ a b c Hipparcos catalog (ESA 1997)
- ↑ a b c Bright Star Catalog
- ↑ Pulkovo radial velocities for 35493 HIP stars
- ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
- ↑ roughly estimated from apparent brightness and distance
- ↑ Al Thalimain Posterior in Jim Kaler